Android图片加载神器之Fresco-加载图片基础[详细图解Fresco的使用]
来源：互联网 发布：网络寄生虫 编辑：程序博客网 时间：2024/05/16 07:04
转载自：http://blog.csdn.net/y1scp/article/details/49245535
Fresco简单的使用—SimpleDraweeView
百学须先立志—学前须知：
在我们平时加载图片(不管是下载还是加载本地图片…..)的时候，我们经常会遇到这样一个需求，那就是当图片正在加载时应该呈现正在加载时的图像，当图片加载失败时应该呈现图片加载时的图像，当我们重新加载这张图片时，应该呈现重试时图像，直到这张图片加载完成。这些繁琐并且重复的如果得不到简化的话，那将是一个开发人员的噩梦，现在好了，我们用 Facebook 出品的一个强大的图片加载组件 Fresco 几行代码就可以搞定以上问题了。
尽信书，不如无书—能学到什么？
1、SimpleDraweeView最基本的使用
2、SimpleDraweeView的圆形图
3、SimpleDraweeView的圆角图
4、SimpleDraweeView的缩放类型工欲善其事必先利其器—下载Fresco并导入到项目
Fresco中文说明：http://www.fresco-cn.org/
Fresco项目GitHub地址：https://github.com/facebook/fresco
第一步进入 Fresco项目GitHub地址 ：
第二步添加Fresco到项目工程：
第三步服务及权限：
<code class="hljs xml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"><!-- 访问网络的权限 --></span><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">uses-permission</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.permission.INTERNET"</span>/></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>
常见问题：
初次使用，我们就先简单书写我们的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_adv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"300dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"300dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
代码分析：
MainActivity 实现代码：
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MainActivity</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AppCompatActivity</span> {</span> <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onCreate</span>(Bundle savedInstanceState) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>简单的书写完布局和实现代码之后我们来运行一下。
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> java<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.lang</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.RuntimeException</span>: Unable to start activity ComponentInfo{scp<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.frescodemo</span>/scp<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.frescodemo</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.MainActivity</span>}: <span class="hljs-label" style="box-sizing: border-box;">android.view.InflateException:</span> Binary XML file line <span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#5: Error inflating class com.facebook.drawee.view.SimpleDraweeView</span> at android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.app</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ActivityThread</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.performLaunchActivity</span>(ActivityThread<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2264</span>) at android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.app</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ActivityThread</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.handleLaunchActivity</span>(ActivityThread<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2313</span>) at android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.app</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ActivityThread</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.access</span>$1100(ActivityThread<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">141</span>) at android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.app</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ActivityThread</span>$H<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.handleMessage</span>(ActivityThread<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1238</span>) at android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.os</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Handler</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.dispatchMessage</span>(Handler<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">102</span>) at android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.os</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Looper</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.loop</span>(Looper<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">136</span>) at android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.app</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ActivityThread</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.main</span>(ActivityThread<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5336</span>) at java<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.lang</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.reflect</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Method</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.invokeNative</span>(Native Method) at java<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.lang</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.reflect</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Method</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.invoke</span>(Method<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">515</span>) at <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.android</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.internal</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.os</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ZygoteInit</span>$MethodAndArgsCaller<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.run</span>(ZygoteInit<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">871</span>) at <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.android</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.internal</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.os</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ZygoteInit</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.main</span>(ZygoteInit<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.java</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">687</span>) at dalvik<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.system</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.NativeStart</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.main</span>(Native Method) Caused by: android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.InflateException</span>: Binary XML file line <span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#5: Error inflating class com.facebook.drawee.view.SimpleDraweeView</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>运行报错了！怎么回事呢？这里啊，是因为我们没有在应用调用 setContentView() 之前进行初始化Fresco造成的；解决办法：
修改我们的 MainActivity 里代码：
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MainActivity</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AppCompatActivity</span> {</span> <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onCreate</span>(Bundle savedInstanceState) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onCreate(savedInstanceState); Fresco.initialize(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>); setContentView(R.layout.activity_main); }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>再运行就没有错误发生了。
占位图—placeholderImage：
在此之前我们需要一张占位图 icon_placeholder.png 大家右键另存为即可：
修改我们的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_adv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul>
代码说明：
MainActivity 无需修改，运行一下：
正在加载图—progressBarImage：
在此之前我们需要一张正在加载图 icon_progress_bar.png 大家右键另存为即可：
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li></ul>
代码说明：
更改我们的 MainActivity 里代码：
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MainActivity</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AppCompatActivity</span> {</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> SimpleDraweeView simpleDraweeView; <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onCreate</span>(Bundle savedInstanceState) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onCreate(savedInstanceState); Fresco.initialize(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>); setContentView(R.layout.activity_main); initView(); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">initView</span>() { <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建SimpleDraweeView对象</span> simpleDraweeView = (SimpleDraweeView) findViewById(R.id.main_sdv); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建将要下载的图片的URI</span> Uri imageUri = Uri.parse(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://my.csdn.net/uploads/avatar/4/E/8/1_y1scp.jpg"</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//开始下载</span> simpleDraweeView.setImageURI(imageUri); }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li></ul>代码分析：
运行效果图：
正在加载图本身是不可以转的，但是呢，加上了
fresco:progressBarAutoRotateInterval="5000"属性，那么它就可以旋转了；可以看到，正在加载图一闪而过，这是因为我们加载的图片很小，网络也很好。失败图—failureImage：
在此之前我们需要一张正在加载图 icon_failure.png 大家右键另存为即可：
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li></ul>
代码分析：
修改我们的 MainActivity 里代码：
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MainActivity</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AppCompatActivity</span> {</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> SimpleDraweeView simpleDraweeView; <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onCreate</span>(Bundle savedInstanceState) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onCreate(savedInstanceState); Fresco.initialize(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>); setContentView(R.layout.activity_main); initView(); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">initView</span>() { <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建SimpleDraweeView对象</span> simpleDraweeView = (SimpleDraweeView) findViewById(R.id.main_sdv); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建将要下载的图片的URI</span> Uri imageUri = Uri.parse(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://my.csdn.net/uploads/avatar_y1scp.jpg"</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//开始下载</span> simpleDraweeView.setImageURI(imageUri); }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li></ul>代码说明：
运行效果：
重试图—retryImage：
在此之前我们需要一张正在加载图 icon_retry.png 大家右键另存为即可：
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:retryImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_retry"</span> fresco:retryImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerCrop"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li></ul>
代码分析：
修改我们的 MainActivity 里代码：
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MainActivity</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AppCompatActivity</span> {</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> SimpleDraweeView simpleDraweeView; <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onCreate</span>(Bundle savedInstanceState) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onCreate(savedInstanceState); Fresco.initialize(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>); setContentView(R.layout.activity_main); initView(); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">initView</span>() { <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建SimpleDraweeView对象</span> simpleDraweeView = (SimpleDraweeView) findViewById(R.id.main_sdv); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建将要下载的图片的URI</span> Uri imageUri = Uri.parse(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://my.csdn.net/uploads/avatar_y1scp.jpg"</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//开始下载</span> simpleDraweeView.setImageURI(imageUri); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建DraweeController</span> DraweeController controller = Fresco.newDraweeControllerBuilder() <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//加载的图片URI地址</span> .setUri(imageUri) <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//设置点击重试是否开启</span> .setTapToRetryEnabled(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>) <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//设置旧的Controller</span> .setOldController(simpleDraweeView.getController()) <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//构建</span> .build(); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//设置DraweeController</span> simpleDraweeView.setController(controller); }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li></ul>代码说明：
运行效果：
注意：
重复加载4次还是没有加载出来的时候才会显示 failureImage(失败图) 的图片
淡入淡出动画—fadeDuration：
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:retryImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_retry"</span> fresco:retryImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerCrop"</span> fresco:fadeDuration=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li></ul>
代码说明：
MainActivity 中的代码无需修改。
运行效果：
重试+进度图+失败图 进度图+正确图 背景图—backgroundImage：
这里呢，我们的背景图采用的是一个系统所提供的颜色中的一种。
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:fadeDuration=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:backgroundImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/holo_orange_light"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>
代码说明：
MainActivity 中的代码无需修改，运行效果：
叠加图—overlayImage：
这里呢，我们的背景图采用的是一个系统所提供的颜色中的一种。
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:retryImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_retry"</span> fresco:retryImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerCrop"</span> fresco:fadeDuration=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:backgroundImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/holo_orange_light"</span> fresco:pressedStateOverlayImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/holo_green_dark"</span> fresco:overlayImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/black"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li></ul>
代码说明：
MainActivity 中的代码无需修改。
运行效果：
从运行效果来看，叠加图在最上面，覆盖了下面的图。
圆形图—roundAsCircle：
一行代码搞定圆形图：设置roundAsCircle为true；
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:retryImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_retry"</span> fresco:retryImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerCrop"</span> fresco:fadeDuration=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:backgroundImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/holo_orange_light"</span> fresco:roundAsCircle=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li></ul>
代码说明：
MainActivity 中的代码无需修改。
运行效果：
可以看到，从图片开始加载一直到图片下载完毕，整个图像都是圆形的。
圆角图—roundedCornerRadius：
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"fitCenter"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerInside"</span> fresco:retryImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_retry"</span> fresco:retryImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"centerCrop"</span> fresco:fadeDuration=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:backgroundImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/holo_orange_light"</span> fresco:roundedCornerRadius=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"30dp"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li></ul>
代码说明：
MainActivity 中的代码无需修改。
运行效果：
可以看到，从图片开始加载一直到图片下载完毕，整个图像都是圆角的。
圆角属性 圆角属性 左上角是否为圆角fresco:roundTopLeft="false"右上角是否为圆角fresco:roundTopRight="false"左下角是否为圆角
fresco:roundBottomLeft="false"右下角是否为圆角fresco:roundBottomRight="false"注意：
当我们同时设置图像显示为圆形图像和圆角图像时，只会显示为圆形图像。
圆形圆角边框宽度及颜色—roundingBorder：
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:retryImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_retry"</span> fresco:retryImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:fadeDuration=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:backgroundImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/holo_orange_light"</span> fresco:roundAsCircle=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:roundedCornerRadius=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"30dp"</span> fresco:roundTopLeft=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:roundTopRight=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:roundBottomLeft=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:roundBottomRight=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:roundingBorderWidth=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"10dp"</span> fresco:roundingBorderColor=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/black"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li></ul>
代码说明：
MainActivity 中的代码无需修改。
运行效果(左边显示的是带边框的圆形图像，右边显示的是带边框的圆角图像)：
圆形或圆角图像底下的叠加颜色—roundWithOverlayColor：
修改我们刚刚书写的 activity_main.xml ：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><RelativeLayout xmlns:android=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res/android"</span> xmlns:fresco=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://schemas.android.com/apk/res-auto"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"match_parent"</span>> <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span> android:id=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@+id/main_sdv"</span> android:layout_width=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_height=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100dp"</span> android:layout_centerInParent=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> fresco:actualImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:placeholderImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_placeholder"</span> fresco:placeholderImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:progressBarImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_progress_bar"</span> fresco:progressBarImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:progressBarAutoRotateInterval=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:failureImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_failure"</span> fresco:failureImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:retryImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@mipmap/icon_retry"</span> fresco:retryImageScaleType=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"focusCrop"</span> fresco:fadeDuration=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"5000"</span> fresco:backgroundImage=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/holo_orange_light"</span> fresco:roundWithOverlayColor=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"@android:color/darker_gray"</span> fresco:roundAsCircle=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"true"</span> ></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.facebook</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawee</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.view</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SimpleDraweeView</span>></RelativeLayout></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li></ul>
代码说明：
MainActivity 中的代码无需修改。
运行效果(左边为圆形效果，右边为圆角效果)：
缩放类型—ScaleType：
类型 描述 center居中，无缩放centerCrop保持宽高比缩小或放大，使得两边都大于或等于显示边界。居中显示。focusCrop同centerCrop, 但居中点不是中点，而是指定的某个点centerInside使两边都在显示边界内，居中显示。如果图尺寸大于显示边界，则保持长宽比缩小图片。fitCenter保持宽高比，缩小或者放大，使得图片完全显示在显示边界内。居中显示fitStart同上。但不居中，和显示边界左上对齐fitEnd同fitCenter， 但不居中，和显示边界右下对齐fitXY不保存宽高比，填充满显示边界none如要使用tile mode显示, 需要设置为none推荐使用：focusCrop 类型
Fresco中文说明对这一点也有详情的说明： 缩放
总结：
XML属性 意义 fadeDuration淡入淡出动画持续时间(单位：毫秒ms)actualImageScaleType实际图像的缩放类型placeholderImage占位图placeholderImageScaleType占位图的缩放类型progressBarImage进度图progressBarImageScaleType进度图的缩放类型progressBarAutoRotateInterval进度图自动旋转间隔时间(单位：毫秒ms)failureImage失败图failureImageScaleType失败图的缩放类型retryImage重试图retryImageScaleType重试图的缩放类型backgroundImage背景图overlayImage叠加图pressedStateOverlayImage按压状态下所显示的叠加图roundAsCircle设置为圆形图roundedCornerRadius圆角半径roundTopLeft左上角是否为圆角roundTopRight右上角是否为圆角roundBottomLeft左下角是否为圆角roundBottomRight右下角是否为圆角roundingBorderWidth圆形或者圆角图边框的宽度roundingBorderColor圆形或者圆角图边框的颜色roundWithOverlayColor圆形或者圆角图底下的叠加颜色(只能设置颜色)viewAspectRatio控件纵横比GitHub：
本教程最终项目GitHub地址：https://github.com/scp504677840/Fresco
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